pitrou commented on code in PR #43234:
URL: https://github.com/apache/arrow/pull/43234#discussion_r1704222408
##########
docs/source/format/CanonicalExtensions.rst:
##########
@@ -283,6 +283,28 @@ UUID
A specific UUID version is not required or guaranteed. This extension
represents
UUIDs as FixedSizeBinary(16) with big-endian notation and does not
interpret the bytes in any way.
+8-bit Boolean
+=============
+
+Bool8 represents a boolean value using 1 byte (8 bits) to store each value
instead of only 1 bit as in
+the original Arrow Boolean type. Although less compact than the original
representation, Bool8 may have
+better zero-copy compatibility with various systems that also store booleans
using 1 byte.
+
+* Extension name: ``arrow.bool8``.
+
+* The storage type of this extension is ``Int8`` where:
+
+ * **false** is denoted by the value ``0``.
+ * **true** can be specified using any non-zero value. Preferably ``1``.
+
+* Extension type parameters:
+
+ This type does not have any parameters.
+
+* Description of the serialization:
+
+ No metadata is required to interpret the type. Any metadata present should
be ignored.
Review Comment:
IMHO we should not leave any ambiguity here. Perhaps reuse the same wording
as for JSON above?
```suggestion
Metadata is either an empty string or a JSON string with an empty object.
```
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